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REPL for this SO post - http://stackoverflow.com/questions/5328007/why-doesnt-option-have-a-fold-method
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| scala> els | |
| res4: Int = 222 | |
| scala> opt | |
| res5: Some[Int] = Some(1) | |
| scala> opt.foldLeft(els)((_,elem) => identity(elem)) | |
| res9: Int = 1 | |
| scala> val optNone: Option[Int] = None | |
| optNone: Option[Int] = None | |
| scala> optNone.foldLeft(els)((_,elem) => identity(elem)) | |
| res10: Int = 222 |
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